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		[page:BufferGeometry] &rarr;

		<h1>管道缓冲几何体（[name]）</h1>

		<p class="desc">创建一个沿着三维曲线延伸的管道。</p>

		<iframe id="scene" src="scenes/geometry-browser.html#TubeGeometry"></iframe>

		<script>

		// iOS iframe auto-resize workaround

		if ( /(iPad|iPhone|iPod)/g.test( navigator.userAgent ) ) {

			const scene = document.getElementById( 'scene' );

			scene.style.width = getComputedStyle( scene ).width;
			scene.style.height = getComputedStyle( scene ).height;
			scene.setAttribute( 'scrolling', 'no' );

		}

		</script>

		<h2>代码示例</h2>

		<code>
		class CustomSinCurve extends THREE.Curve {

			constructor( scale = 1 ) {

				super();

				this.scale = scale;

			}

			getPoint( t, optionalTarget = new THREE.Vector3() ) {

				const tx = t * 3 - 1.5;
				const ty = Math.sin( 2 * Math.PI * t );
				const tz = 0;

				return optionalTarget.set( tx, ty, tz ).multiplyScalar( this.scale );

			}

		}

		const path = new CustomSinCurve( 10 );
		const geometry = new THREE.TubeGeometry( path, 20, 2, 8, false );
		const material = new THREE.MeshBasicMaterial( { color: 0x00ff00 } );
		const mesh = new THREE.Mesh( geometry, material );
		scene.add( mesh );
		</code>

		<h2>构造器</h2>


		<h3>[name]([param:Curve path], [param:Integer tubularSegments], [param:Float radius], [param:Integer radialSegments], [param:Boolean closed])</h3>
		<p>
				path — [page:Curve] - 一个由基类[page:Curve]继承而来的3D路径。 Default is a quadratic bezier curve.<br />
				tubularSegments — [page:Integer] - 组成这一管道的分段数，默认值为64。<br />
				radius — [page:Float] - 管道的半径，默认值为1。<br />
				radialSegments — [page:Integer] - 管道横截面的分段数目，默认值为8。<br />
				closed — [page:Boolean] 管道的两端是否闭合，默认值为false。<br />
		</p>


		<h2>属性</h2>
		<p>共有属性请参见其基类[page:BufferGeometry]。</p>

		<h3>[property:Object parameters]</h3>
		<p>
				一个包含着构造函数中每个参数的对象。在对象实例化之后，对该属性的任何修改都不会改变这个几何体。
</p>

		<h3>[property:Array tangents]</h3>
		<p>
			一个[page:Vector3]切线数组。
		</p>

		<h3>[property:Array normals]</h3>
		<p>
			一个[page:Vector3]法线数组。
		</p>

		<h3>[property:Array binormals]</h3>
		<p>
			一个[page:Vector3]次法线数组。
		</p>

		<h2>方法(Methods)</h2>
		<p>共有方法请参见其基类[page:BufferGeometry]。</p>

		<h2>源代码</h2>

		<p>
			[link:https://github.com/mrdoob/three.js/blob/master/src/[path].js src/[path].js]
		</p>
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